FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * LUMPKINS ROBERT L   2. Issuer Name and Ticker or Trading Symbol MOSAIC CO [MOS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THE MOSAIC COMPANY, 3033 CAMPUS DRIVE, SUITE E490 3. Date of Earliest Transaction (Month/Day/Year) 04/08/2015 (Street) PLYMOUTH, MN 55441 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock               3,031 I By GRAT #5 dated June 25, 2012 (1) Common Stock 04/08/2015   G   8,575 D $ 0 0 D   Common Stock 04/08/2015   G   7,875 D $ 0 0 I Robert L. Lumpkins Revocable Trust Common Stock 04/08/2015   G   16,450 A $ 0 16,450 I By GRAT #6 dated April 2, 2015 (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Restricted Stock Units

$ 0 (3)

(4)

(5)

Common Stock

4,719

4,719

D

Restricted Stock Units

$ 0 (3)

(6)

(5)

Common Stock

3,350

3,350

D

Restricted Stock Units

$ 0 (3)

(7)

(5)

Common Stock

5,274

5,274

D

Restricted Stock Units

$ 0 (3)

05/14/2015

A

5,707

(8)

(5)

Common Stock

5,707

$ 0

5,707

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LUMPKINS ROBERT L C/O THE MOSAIC COMPANY 3033 CAMPUS DRIVE, SUITE E490 PLYMOUTH, MN 55441	X

Signatures

/s/Mark J. Isaacson, Attorney-in-Fact for Robert L. Lumpkins		05/15/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On July 15, 2014, the reporting person indirectly held 5,977 shares of MOS common stock in a grantor retained annuity trust for the benefit of himself and his daughter ("GRAT #5). On that date, 2,946 of the shares were distributed by GRAT #5 to the Robert L. Lumpkins Revocable Trust in satisfaction of an annuity to the reporting person and was exempt from reporting under Rule 16a-13, following which 5,977 shares remained held by GRAT #5.
(2)	This transaction involved a gift of securities by the reporting person and the reporting person and reporting person's spouse as trustees of the Robert L. Lumpkins Revocable Trust to a grantor retained annuity trust dated April 2, 2015, for the benefit of reporting person and his daughter ("GRAT #6"). The reporting person's spouse serves as trustee of GRAT #6.
(3)	One-for-One
(4)	The restricted stock units vested on October 4, 2013. Vested shares will be delivered to the reporting person on October 4, 2015.
(5)	Not Applicable
(6)	The restricted stock units vested on May 15, 2014. Vested shares will be delivered to the reporting person on October 3, 2016.
(7)	The restricted stock units vested on May 14, 2015. Vested shares will be delivered to the reporting person on May 15, 2017.
(8)	The restricted stock units will vest on the date of the issuer's 2016 Annual Meeting of Stockholders. Vested shares will be delivered to the reporting person on May 14, 2018.

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